mirror of https://gitee.com/openkylin/linux.git
2472 lines
66 KiB
C
2472 lines
66 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir2.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_da_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_dir2_sf.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_inode_item.h"
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#include "xfs_alloc.h"
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#include "xfs_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_attr.h"
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#include "xfs_attr_leaf.h"
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#include "xfs_dir2_data.h"
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#include "xfs_dir2_leaf.h"
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#include "xfs_dir2_block.h"
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#include "xfs_dir2_node.h"
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#include "xfs_error.h"
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/*
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* xfs_da_btree.c
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*
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* Routines to implement directories as Btrees of hashed names.
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*/
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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/*
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* Routines used for growing the Btree.
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*/
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STATIC int xfs_da_root_split(xfs_da_state_t *state,
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xfs_da_state_blk_t *existing_root,
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xfs_da_state_blk_t *new_child);
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STATIC int xfs_da_node_split(xfs_da_state_t *state,
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xfs_da_state_blk_t *existing_blk,
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xfs_da_state_blk_t *split_blk,
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xfs_da_state_blk_t *blk_to_add,
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int treelevel,
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int *result);
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STATIC void xfs_da_node_rebalance(xfs_da_state_t *state,
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xfs_da_state_blk_t *node_blk_1,
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xfs_da_state_blk_t *node_blk_2);
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STATIC void xfs_da_node_add(xfs_da_state_t *state,
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xfs_da_state_blk_t *old_node_blk,
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xfs_da_state_blk_t *new_node_blk);
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/*
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* Routines used for shrinking the Btree.
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*/
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STATIC int xfs_da_root_join(xfs_da_state_t *state,
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xfs_da_state_blk_t *root_blk);
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STATIC int xfs_da_node_toosmall(xfs_da_state_t *state, int *retval);
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STATIC void xfs_da_node_remove(xfs_da_state_t *state,
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xfs_da_state_blk_t *drop_blk);
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STATIC void xfs_da_node_unbalance(xfs_da_state_t *state,
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xfs_da_state_blk_t *src_node_blk,
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xfs_da_state_blk_t *dst_node_blk);
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/*
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* Utility routines.
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*/
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STATIC uint xfs_da_node_lasthash(xfs_dabuf_t *bp, int *count);
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STATIC int xfs_da_node_order(xfs_dabuf_t *node1_bp, xfs_dabuf_t *node2_bp);
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STATIC xfs_dabuf_t *xfs_da_buf_make(int nbuf, xfs_buf_t **bps, inst_t *ra);
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STATIC int xfs_da_blk_unlink(xfs_da_state_t *state,
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xfs_da_state_blk_t *drop_blk,
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xfs_da_state_blk_t *save_blk);
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STATIC void xfs_da_state_kill_altpath(xfs_da_state_t *state);
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/*========================================================================
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* Routines used for growing the Btree.
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*========================================================================*/
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/*
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* Create the initial contents of an intermediate node.
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*/
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int
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xfs_da_node_create(xfs_da_args_t *args, xfs_dablk_t blkno, int level,
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xfs_dabuf_t **bpp, int whichfork)
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{
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xfs_da_intnode_t *node;
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xfs_dabuf_t *bp;
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int error;
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xfs_trans_t *tp;
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tp = args->trans;
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error = xfs_da_get_buf(tp, args->dp, blkno, -1, &bp, whichfork);
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if (error)
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return(error);
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ASSERT(bp != NULL);
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node = bp->data;
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node->hdr.info.forw = 0;
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node->hdr.info.back = 0;
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node->hdr.info.magic = cpu_to_be16(XFS_DA_NODE_MAGIC);
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node->hdr.info.pad = 0;
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node->hdr.count = 0;
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node->hdr.level = cpu_to_be16(level);
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xfs_da_log_buf(tp, bp,
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XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr)));
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*bpp = bp;
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return(0);
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}
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/*
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* Split a leaf node, rebalance, then possibly split
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* intermediate nodes, rebalance, etc.
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*/
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int /* error */
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xfs_da_split(xfs_da_state_t *state)
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{
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xfs_da_state_blk_t *oldblk, *newblk, *addblk;
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xfs_da_intnode_t *node;
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xfs_dabuf_t *bp;
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int max, action, error, i;
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/*
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* Walk back up the tree splitting/inserting/adjusting as necessary.
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* If we need to insert and there isn't room, split the node, then
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* decide which fragment to insert the new block from below into.
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* Note that we may split the root this way, but we need more fixup.
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*/
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max = state->path.active - 1;
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ASSERT((max >= 0) && (max < XFS_DA_NODE_MAXDEPTH));
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ASSERT(state->path.blk[max].magic == XFS_ATTR_LEAF_MAGIC ||
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state->path.blk[max].magic == XFS_DIR2_LEAFN_MAGIC);
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addblk = &state->path.blk[max]; /* initial dummy value */
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for (i = max; (i >= 0) && addblk; state->path.active--, i--) {
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oldblk = &state->path.blk[i];
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newblk = &state->altpath.blk[i];
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/*
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* If a leaf node then
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* Allocate a new leaf node, then rebalance across them.
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* else if an intermediate node then
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* We split on the last layer, must we split the node?
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*/
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switch (oldblk->magic) {
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case XFS_ATTR_LEAF_MAGIC:
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error = xfs_attr_leaf_split(state, oldblk, newblk);
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if ((error != 0) && (error != ENOSPC)) {
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return(error); /* GROT: attr is inconsistent */
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}
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if (!error) {
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addblk = newblk;
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break;
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}
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/*
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* Entry wouldn't fit, split the leaf again.
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*/
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state->extravalid = 1;
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if (state->inleaf) {
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state->extraafter = 0; /* before newblk */
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error = xfs_attr_leaf_split(state, oldblk,
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&state->extrablk);
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} else {
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state->extraafter = 1; /* after newblk */
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error = xfs_attr_leaf_split(state, newblk,
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&state->extrablk);
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}
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if (error)
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return(error); /* GROT: attr inconsistent */
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addblk = newblk;
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break;
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case XFS_DIR2_LEAFN_MAGIC:
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error = xfs_dir2_leafn_split(state, oldblk, newblk);
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if (error)
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return error;
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addblk = newblk;
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break;
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case XFS_DA_NODE_MAGIC:
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error = xfs_da_node_split(state, oldblk, newblk, addblk,
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max - i, &action);
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xfs_da_buf_done(addblk->bp);
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addblk->bp = NULL;
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if (error)
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return(error); /* GROT: dir is inconsistent */
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/*
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* Record the newly split block for the next time thru?
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*/
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if (action)
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addblk = newblk;
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else
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addblk = NULL;
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break;
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}
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/*
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* Update the btree to show the new hashval for this child.
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*/
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xfs_da_fixhashpath(state, &state->path);
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/*
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* If we won't need this block again, it's getting dropped
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* from the active path by the loop control, so we need
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* to mark it done now.
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*/
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if (i > 0 || !addblk)
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xfs_da_buf_done(oldblk->bp);
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}
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if (!addblk)
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return(0);
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/*
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* Split the root node.
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*/
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ASSERT(state->path.active == 0);
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oldblk = &state->path.blk[0];
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error = xfs_da_root_split(state, oldblk, addblk);
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if (error) {
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xfs_da_buf_done(oldblk->bp);
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xfs_da_buf_done(addblk->bp);
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addblk->bp = NULL;
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return(error); /* GROT: dir is inconsistent */
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}
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/*
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* Update pointers to the node which used to be block 0 and
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* just got bumped because of the addition of a new root node.
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* There might be three blocks involved if a double split occurred,
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* and the original block 0 could be at any position in the list.
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*/
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node = oldblk->bp->data;
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if (node->hdr.info.forw) {
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if (be32_to_cpu(node->hdr.info.forw) == addblk->blkno) {
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bp = addblk->bp;
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} else {
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ASSERT(state->extravalid);
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bp = state->extrablk.bp;
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}
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node = bp->data;
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node->hdr.info.back = cpu_to_be32(oldblk->blkno);
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xfs_da_log_buf(state->args->trans, bp,
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XFS_DA_LOGRANGE(node, &node->hdr.info,
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sizeof(node->hdr.info)));
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}
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node = oldblk->bp->data;
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if (node->hdr.info.back) {
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if (be32_to_cpu(node->hdr.info.back) == addblk->blkno) {
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bp = addblk->bp;
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} else {
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ASSERT(state->extravalid);
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bp = state->extrablk.bp;
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}
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node = bp->data;
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node->hdr.info.forw = cpu_to_be32(oldblk->blkno);
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xfs_da_log_buf(state->args->trans, bp,
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XFS_DA_LOGRANGE(node, &node->hdr.info,
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sizeof(node->hdr.info)));
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}
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xfs_da_buf_done(oldblk->bp);
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xfs_da_buf_done(addblk->bp);
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addblk->bp = NULL;
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return(0);
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}
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/*
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* Split the root. We have to create a new root and point to the two
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* parts (the split old root) that we just created. Copy block zero to
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* the EOF, extending the inode in process.
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*/
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STATIC int /* error */
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xfs_da_root_split(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
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xfs_da_state_blk_t *blk2)
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{
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xfs_da_intnode_t *node, *oldroot;
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xfs_da_args_t *args;
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xfs_dablk_t blkno;
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xfs_dabuf_t *bp;
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int error, size;
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xfs_inode_t *dp;
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xfs_trans_t *tp;
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xfs_mount_t *mp;
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xfs_dir2_leaf_t *leaf;
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/*
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* Copy the existing (incorrect) block from the root node position
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* to a free space somewhere.
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*/
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args = state->args;
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ASSERT(args != NULL);
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error = xfs_da_grow_inode(args, &blkno);
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if (error)
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return(error);
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dp = args->dp;
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tp = args->trans;
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mp = state->mp;
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error = xfs_da_get_buf(tp, dp, blkno, -1, &bp, args->whichfork);
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if (error)
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return(error);
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ASSERT(bp != NULL);
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node = bp->data;
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oldroot = blk1->bp->data;
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if (be16_to_cpu(oldroot->hdr.info.magic) == XFS_DA_NODE_MAGIC) {
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size = (int)((char *)&oldroot->btree[be16_to_cpu(oldroot->hdr.count)] -
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(char *)oldroot);
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} else {
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ASSERT(be16_to_cpu(oldroot->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC);
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leaf = (xfs_dir2_leaf_t *)oldroot;
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size = (int)((char *)&leaf->ents[be16_to_cpu(leaf->hdr.count)] -
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(char *)leaf);
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}
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memcpy(node, oldroot, size);
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xfs_da_log_buf(tp, bp, 0, size - 1);
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xfs_da_buf_done(blk1->bp);
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blk1->bp = bp;
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blk1->blkno = blkno;
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/*
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* Set up the new root node.
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*/
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error = xfs_da_node_create(args,
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(args->whichfork == XFS_DATA_FORK) ? mp->m_dirleafblk : 0,
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be16_to_cpu(node->hdr.level) + 1, &bp, args->whichfork);
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if (error)
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return(error);
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node = bp->data;
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node->btree[0].hashval = cpu_to_be32(blk1->hashval);
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node->btree[0].before = cpu_to_be32(blk1->blkno);
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node->btree[1].hashval = cpu_to_be32(blk2->hashval);
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node->btree[1].before = cpu_to_be32(blk2->blkno);
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node->hdr.count = cpu_to_be16(2);
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#ifdef DEBUG
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if (be16_to_cpu(oldroot->hdr.info.magic) == XFS_DIR2_LEAFN_MAGIC) {
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ASSERT(blk1->blkno >= mp->m_dirleafblk &&
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blk1->blkno < mp->m_dirfreeblk);
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ASSERT(blk2->blkno >= mp->m_dirleafblk &&
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blk2->blkno < mp->m_dirfreeblk);
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}
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#endif
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/* Header is already logged by xfs_da_node_create */
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xfs_da_log_buf(tp, bp,
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XFS_DA_LOGRANGE(node, node->btree,
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sizeof(xfs_da_node_entry_t) * 2));
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xfs_da_buf_done(bp);
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return(0);
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}
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/*
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* Split the node, rebalance, then add the new entry.
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*/
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STATIC int /* error */
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xfs_da_node_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
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xfs_da_state_blk_t *newblk,
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xfs_da_state_blk_t *addblk,
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int treelevel, int *result)
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{
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xfs_da_intnode_t *node;
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xfs_dablk_t blkno;
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int newcount, error;
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int useextra;
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node = oldblk->bp->data;
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ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
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/*
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* With V2 dirs the extra block is data or freespace.
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*/
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useextra = state->extravalid && state->args->whichfork == XFS_ATTR_FORK;
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newcount = 1 + useextra;
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/*
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* Do we have to split the node?
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*/
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if ((be16_to_cpu(node->hdr.count) + newcount) > state->node_ents) {
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/*
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* Allocate a new node, add to the doubly linked chain of
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* nodes, then move some of our excess entries into it.
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*/
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error = xfs_da_grow_inode(state->args, &blkno);
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if (error)
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return(error); /* GROT: dir is inconsistent */
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error = xfs_da_node_create(state->args, blkno, treelevel,
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&newblk->bp, state->args->whichfork);
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if (error)
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return(error); /* GROT: dir is inconsistent */
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newblk->blkno = blkno;
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newblk->magic = XFS_DA_NODE_MAGIC;
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xfs_da_node_rebalance(state, oldblk, newblk);
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error = xfs_da_blk_link(state, oldblk, newblk);
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if (error)
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return(error);
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*result = 1;
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} else {
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*result = 0;
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}
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/*
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* Insert the new entry(s) into the correct block
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* (updating last hashval in the process).
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*
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* xfs_da_node_add() inserts BEFORE the given index,
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* and as a result of using node_lookup_int() we always
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* point to a valid entry (not after one), but a split
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* operation always results in a new block whose hashvals
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* FOLLOW the current block.
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*
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* If we had double-split op below us, then add the extra block too.
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*/
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node = oldblk->bp->data;
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if (oldblk->index <= be16_to_cpu(node->hdr.count)) {
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oldblk->index++;
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xfs_da_node_add(state, oldblk, addblk);
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if (useextra) {
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if (state->extraafter)
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oldblk->index++;
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xfs_da_node_add(state, oldblk, &state->extrablk);
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state->extravalid = 0;
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}
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} else {
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newblk->index++;
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xfs_da_node_add(state, newblk, addblk);
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if (useextra) {
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if (state->extraafter)
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newblk->index++;
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xfs_da_node_add(state, newblk, &state->extrablk);
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state->extravalid = 0;
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}
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}
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return(0);
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}
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/*
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* Balance the btree elements between two intermediate nodes,
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* usually one full and one empty.
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*
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* NOTE: if blk2 is empty, then it will get the upper half of blk1.
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*/
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|
STATIC void
|
|
xfs_da_node_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
|
|
xfs_da_state_blk_t *blk2)
|
|
{
|
|
xfs_da_intnode_t *node1, *node2, *tmpnode;
|
|
xfs_da_node_entry_t *btree_s, *btree_d;
|
|
int count, tmp;
|
|
xfs_trans_t *tp;
|
|
|
|
node1 = blk1->bp->data;
|
|
node2 = blk2->bp->data;
|
|
/*
|
|
* Figure out how many entries need to move, and in which direction.
|
|
* Swap the nodes around if that makes it simpler.
|
|
*/
|
|
if ((be16_to_cpu(node1->hdr.count) > 0) && (be16_to_cpu(node2->hdr.count) > 0) &&
|
|
((be32_to_cpu(node2->btree[0].hashval) < be32_to_cpu(node1->btree[0].hashval)) ||
|
|
(be32_to_cpu(node2->btree[be16_to_cpu(node2->hdr.count)-1].hashval) <
|
|
be32_to_cpu(node1->btree[be16_to_cpu(node1->hdr.count)-1].hashval)))) {
|
|
tmpnode = node1;
|
|
node1 = node2;
|
|
node2 = tmpnode;
|
|
}
|
|
ASSERT(be16_to_cpu(node1->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
ASSERT(be16_to_cpu(node2->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
count = (be16_to_cpu(node1->hdr.count) - be16_to_cpu(node2->hdr.count)) / 2;
|
|
if (count == 0)
|
|
return;
|
|
tp = state->args->trans;
|
|
/*
|
|
* Two cases: high-to-low and low-to-high.
|
|
*/
|
|
if (count > 0) {
|
|
/*
|
|
* Move elements in node2 up to make a hole.
|
|
*/
|
|
if ((tmp = be16_to_cpu(node2->hdr.count)) > 0) {
|
|
tmp *= (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &node2->btree[0];
|
|
btree_d = &node2->btree[count];
|
|
memmove(btree_d, btree_s, tmp);
|
|
}
|
|
|
|
/*
|
|
* Move the req'd B-tree elements from high in node1 to
|
|
* low in node2.
|
|
*/
|
|
be16_add_cpu(&node2->hdr.count, count);
|
|
tmp = count * (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &node1->btree[be16_to_cpu(node1->hdr.count) - count];
|
|
btree_d = &node2->btree[0];
|
|
memcpy(btree_d, btree_s, tmp);
|
|
be16_add_cpu(&node1->hdr.count, -count);
|
|
} else {
|
|
/*
|
|
* Move the req'd B-tree elements from low in node2 to
|
|
* high in node1.
|
|
*/
|
|
count = -count;
|
|
tmp = count * (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &node2->btree[0];
|
|
btree_d = &node1->btree[be16_to_cpu(node1->hdr.count)];
|
|
memcpy(btree_d, btree_s, tmp);
|
|
be16_add_cpu(&node1->hdr.count, count);
|
|
xfs_da_log_buf(tp, blk1->bp,
|
|
XFS_DA_LOGRANGE(node1, btree_d, tmp));
|
|
|
|
/*
|
|
* Move elements in node2 down to fill the hole.
|
|
*/
|
|
tmp = be16_to_cpu(node2->hdr.count) - count;
|
|
tmp *= (uint)sizeof(xfs_da_node_entry_t);
|
|
btree_s = &node2->btree[count];
|
|
btree_d = &node2->btree[0];
|
|
memmove(btree_d, btree_s, tmp);
|
|
be16_add_cpu(&node2->hdr.count, -count);
|
|
}
|
|
|
|
/*
|
|
* Log header of node 1 and all current bits of node 2.
|
|
*/
|
|
xfs_da_log_buf(tp, blk1->bp,
|
|
XFS_DA_LOGRANGE(node1, &node1->hdr, sizeof(node1->hdr)));
|
|
xfs_da_log_buf(tp, blk2->bp,
|
|
XFS_DA_LOGRANGE(node2, &node2->hdr,
|
|
sizeof(node2->hdr) +
|
|
sizeof(node2->btree[0]) * be16_to_cpu(node2->hdr.count)));
|
|
|
|
/*
|
|
* Record the last hashval from each block for upward propagation.
|
|
* (note: don't use the swapped node pointers)
|
|
*/
|
|
node1 = blk1->bp->data;
|
|
node2 = blk2->bp->data;
|
|
blk1->hashval = be32_to_cpu(node1->btree[be16_to_cpu(node1->hdr.count)-1].hashval);
|
|
blk2->hashval = be32_to_cpu(node2->btree[be16_to_cpu(node2->hdr.count)-1].hashval);
|
|
|
|
/*
|
|
* Adjust the expected index for insertion.
|
|
*/
|
|
if (blk1->index >= be16_to_cpu(node1->hdr.count)) {
|
|
blk2->index = blk1->index - be16_to_cpu(node1->hdr.count);
|
|
blk1->index = be16_to_cpu(node1->hdr.count) + 1; /* make it invalid */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add a new entry to an intermediate node.
|
|
*/
|
|
STATIC void
|
|
xfs_da_node_add(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
|
|
xfs_da_state_blk_t *newblk)
|
|
{
|
|
xfs_da_intnode_t *node;
|
|
xfs_da_node_entry_t *btree;
|
|
int tmp;
|
|
xfs_mount_t *mp;
|
|
|
|
node = oldblk->bp->data;
|
|
mp = state->mp;
|
|
ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
ASSERT((oldblk->index >= 0) && (oldblk->index <= be16_to_cpu(node->hdr.count)));
|
|
ASSERT(newblk->blkno != 0);
|
|
if (state->args->whichfork == XFS_DATA_FORK)
|
|
ASSERT(newblk->blkno >= mp->m_dirleafblk &&
|
|
newblk->blkno < mp->m_dirfreeblk);
|
|
|
|
/*
|
|
* We may need to make some room before we insert the new node.
|
|
*/
|
|
tmp = 0;
|
|
btree = &node->btree[ oldblk->index ];
|
|
if (oldblk->index < be16_to_cpu(node->hdr.count)) {
|
|
tmp = (be16_to_cpu(node->hdr.count) - oldblk->index) * (uint)sizeof(*btree);
|
|
memmove(btree + 1, btree, tmp);
|
|
}
|
|
btree->hashval = cpu_to_be32(newblk->hashval);
|
|
btree->before = cpu_to_be32(newblk->blkno);
|
|
xfs_da_log_buf(state->args->trans, oldblk->bp,
|
|
XFS_DA_LOGRANGE(node, btree, tmp + sizeof(*btree)));
|
|
be16_add_cpu(&node->hdr.count, 1);
|
|
xfs_da_log_buf(state->args->trans, oldblk->bp,
|
|
XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr)));
|
|
|
|
/*
|
|
* Copy the last hash value from the oldblk to propagate upwards.
|
|
*/
|
|
oldblk->hashval = be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1 ].hashval);
|
|
}
|
|
|
|
/*========================================================================
|
|
* Routines used for shrinking the Btree.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Deallocate an empty leaf node, remove it from its parent,
|
|
* possibly deallocating that block, etc...
|
|
*/
|
|
int
|
|
xfs_da_join(xfs_da_state_t *state)
|
|
{
|
|
xfs_da_state_blk_t *drop_blk, *save_blk;
|
|
int action, error;
|
|
|
|
action = 0;
|
|
drop_blk = &state->path.blk[ state->path.active-1 ];
|
|
save_blk = &state->altpath.blk[ state->path.active-1 ];
|
|
ASSERT(state->path.blk[0].magic == XFS_DA_NODE_MAGIC);
|
|
ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC ||
|
|
drop_blk->magic == XFS_DIR2_LEAFN_MAGIC);
|
|
|
|
/*
|
|
* Walk back up the tree joining/deallocating as necessary.
|
|
* When we stop dropping blocks, break out.
|
|
*/
|
|
for ( ; state->path.active >= 2; drop_blk--, save_blk--,
|
|
state->path.active--) {
|
|
/*
|
|
* See if we can combine the block with a neighbor.
|
|
* (action == 0) => no options, just leave
|
|
* (action == 1) => coalesce, then unlink
|
|
* (action == 2) => block empty, unlink it
|
|
*/
|
|
switch (drop_blk->magic) {
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
error = xfs_attr_leaf_toosmall(state, &action);
|
|
if (error)
|
|
return(error);
|
|
if (action == 0)
|
|
return(0);
|
|
xfs_attr_leaf_unbalance(state, drop_blk, save_blk);
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
error = xfs_dir2_leafn_toosmall(state, &action);
|
|
if (error)
|
|
return error;
|
|
if (action == 0)
|
|
return 0;
|
|
xfs_dir2_leafn_unbalance(state, drop_blk, save_blk);
|
|
break;
|
|
case XFS_DA_NODE_MAGIC:
|
|
/*
|
|
* Remove the offending node, fixup hashvals,
|
|
* check for a toosmall neighbor.
|
|
*/
|
|
xfs_da_node_remove(state, drop_blk);
|
|
xfs_da_fixhashpath(state, &state->path);
|
|
error = xfs_da_node_toosmall(state, &action);
|
|
if (error)
|
|
return(error);
|
|
if (action == 0)
|
|
return 0;
|
|
xfs_da_node_unbalance(state, drop_blk, save_blk);
|
|
break;
|
|
}
|
|
xfs_da_fixhashpath(state, &state->altpath);
|
|
error = xfs_da_blk_unlink(state, drop_blk, save_blk);
|
|
xfs_da_state_kill_altpath(state);
|
|
if (error)
|
|
return(error);
|
|
error = xfs_da_shrink_inode(state->args, drop_blk->blkno,
|
|
drop_blk->bp);
|
|
drop_blk->bp = NULL;
|
|
if (error)
|
|
return(error);
|
|
}
|
|
/*
|
|
* We joined all the way to the top. If it turns out that
|
|
* we only have one entry in the root, make the child block
|
|
* the new root.
|
|
*/
|
|
xfs_da_node_remove(state, drop_blk);
|
|
xfs_da_fixhashpath(state, &state->path);
|
|
error = xfs_da_root_join(state, &state->path.blk[0]);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* We have only one entry in the root. Copy the only remaining child of
|
|
* the old root to block 0 as the new root node.
|
|
*/
|
|
STATIC int
|
|
xfs_da_root_join(xfs_da_state_t *state, xfs_da_state_blk_t *root_blk)
|
|
{
|
|
xfs_da_intnode_t *oldroot;
|
|
/* REFERENCED */
|
|
xfs_da_blkinfo_t *blkinfo;
|
|
xfs_da_args_t *args;
|
|
xfs_dablk_t child;
|
|
xfs_dabuf_t *bp;
|
|
int error;
|
|
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
ASSERT(root_blk->magic == XFS_DA_NODE_MAGIC);
|
|
oldroot = root_blk->bp->data;
|
|
ASSERT(be16_to_cpu(oldroot->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
ASSERT(!oldroot->hdr.info.forw);
|
|
ASSERT(!oldroot->hdr.info.back);
|
|
|
|
/*
|
|
* If the root has more than one child, then don't do anything.
|
|
*/
|
|
if (be16_to_cpu(oldroot->hdr.count) > 1)
|
|
return(0);
|
|
|
|
/*
|
|
* Read in the (only) child block, then copy those bytes into
|
|
* the root block's buffer and free the original child block.
|
|
*/
|
|
child = be32_to_cpu(oldroot->btree[0].before);
|
|
ASSERT(child != 0);
|
|
error = xfs_da_read_buf(args->trans, args->dp, child, -1, &bp,
|
|
args->whichfork);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
blkinfo = bp->data;
|
|
if (be16_to_cpu(oldroot->hdr.level) == 1) {
|
|
ASSERT(be16_to_cpu(blkinfo->magic) == XFS_DIR2_LEAFN_MAGIC ||
|
|
be16_to_cpu(blkinfo->magic) == XFS_ATTR_LEAF_MAGIC);
|
|
} else {
|
|
ASSERT(be16_to_cpu(blkinfo->magic) == XFS_DA_NODE_MAGIC);
|
|
}
|
|
ASSERT(!blkinfo->forw);
|
|
ASSERT(!blkinfo->back);
|
|
memcpy(root_blk->bp->data, bp->data, state->blocksize);
|
|
xfs_da_log_buf(args->trans, root_blk->bp, 0, state->blocksize - 1);
|
|
error = xfs_da_shrink_inode(args, child, bp);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Check a node block and its neighbors to see if the block should be
|
|
* collapsed into one or the other neighbor. Always keep the block
|
|
* with the smaller block number.
|
|
* If the current block is over 50% full, don't try to join it, return 0.
|
|
* If the block is empty, fill in the state structure and return 2.
|
|
* If it can be collapsed, fill in the state structure and return 1.
|
|
* If nothing can be done, return 0.
|
|
*/
|
|
STATIC int
|
|
xfs_da_node_toosmall(xfs_da_state_t *state, int *action)
|
|
{
|
|
xfs_da_intnode_t *node;
|
|
xfs_da_state_blk_t *blk;
|
|
xfs_da_blkinfo_t *info;
|
|
int count, forward, error, retval, i;
|
|
xfs_dablk_t blkno;
|
|
xfs_dabuf_t *bp;
|
|
|
|
/*
|
|
* Check for the degenerate case of the block being over 50% full.
|
|
* If so, it's not worth even looking to see if we might be able
|
|
* to coalesce with a sibling.
|
|
*/
|
|
blk = &state->path.blk[ state->path.active-1 ];
|
|
info = blk->bp->data;
|
|
ASSERT(be16_to_cpu(info->magic) == XFS_DA_NODE_MAGIC);
|
|
node = (xfs_da_intnode_t *)info;
|
|
count = be16_to_cpu(node->hdr.count);
|
|
if (count > (state->node_ents >> 1)) {
|
|
*action = 0; /* blk over 50%, don't try to join */
|
|
return(0); /* blk over 50%, don't try to join */
|
|
}
|
|
|
|
/*
|
|
* Check for the degenerate case of the block being empty.
|
|
* If the block is empty, we'll simply delete it, no need to
|
|
* coalesce it with a sibling block. We choose (arbitrarily)
|
|
* to merge with the forward block unless it is NULL.
|
|
*/
|
|
if (count == 0) {
|
|
/*
|
|
* Make altpath point to the block we want to keep and
|
|
* path point to the block we want to drop (this one).
|
|
*/
|
|
forward = (info->forw != 0);
|
|
memcpy(&state->altpath, &state->path, sizeof(state->path));
|
|
error = xfs_da_path_shift(state, &state->altpath, forward,
|
|
0, &retval);
|
|
if (error)
|
|
return(error);
|
|
if (retval) {
|
|
*action = 0;
|
|
} else {
|
|
*action = 2;
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Examine each sibling block to see if we can coalesce with
|
|
* at least 25% free space to spare. We need to figure out
|
|
* whether to merge with the forward or the backward block.
|
|
* We prefer coalescing with the lower numbered sibling so as
|
|
* to shrink a directory over time.
|
|
*/
|
|
/* start with smaller blk num */
|
|
forward = (be32_to_cpu(info->forw) < be32_to_cpu(info->back));
|
|
for (i = 0; i < 2; forward = !forward, i++) {
|
|
if (forward)
|
|
blkno = be32_to_cpu(info->forw);
|
|
else
|
|
blkno = be32_to_cpu(info->back);
|
|
if (blkno == 0)
|
|
continue;
|
|
error = xfs_da_read_buf(state->args->trans, state->args->dp,
|
|
blkno, -1, &bp, state->args->whichfork);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
|
|
node = (xfs_da_intnode_t *)info;
|
|
count = state->node_ents;
|
|
count -= state->node_ents >> 2;
|
|
count -= be16_to_cpu(node->hdr.count);
|
|
node = bp->data;
|
|
ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
count -= be16_to_cpu(node->hdr.count);
|
|
xfs_da_brelse(state->args->trans, bp);
|
|
if (count >= 0)
|
|
break; /* fits with at least 25% to spare */
|
|
}
|
|
if (i >= 2) {
|
|
*action = 0;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Make altpath point to the block we want to keep (the lower
|
|
* numbered block) and path point to the block we want to drop.
|
|
*/
|
|
memcpy(&state->altpath, &state->path, sizeof(state->path));
|
|
if (blkno < blk->blkno) {
|
|
error = xfs_da_path_shift(state, &state->altpath, forward,
|
|
0, &retval);
|
|
if (error) {
|
|
return(error);
|
|
}
|
|
if (retval) {
|
|
*action = 0;
|
|
return(0);
|
|
}
|
|
} else {
|
|
error = xfs_da_path_shift(state, &state->path, forward,
|
|
0, &retval);
|
|
if (error) {
|
|
return(error);
|
|
}
|
|
if (retval) {
|
|
*action = 0;
|
|
return(0);
|
|
}
|
|
}
|
|
*action = 1;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Walk back up the tree adjusting hash values as necessary,
|
|
* when we stop making changes, return.
|
|
*/
|
|
void
|
|
xfs_da_fixhashpath(xfs_da_state_t *state, xfs_da_state_path_t *path)
|
|
{
|
|
xfs_da_state_blk_t *blk;
|
|
xfs_da_intnode_t *node;
|
|
xfs_da_node_entry_t *btree;
|
|
xfs_dahash_t lasthash=0;
|
|
int level, count;
|
|
|
|
level = path->active-1;
|
|
blk = &path->blk[ level ];
|
|
switch (blk->magic) {
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
lasthash = xfs_attr_leaf_lasthash(blk->bp, &count);
|
|
if (count == 0)
|
|
return;
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
lasthash = xfs_dir2_leafn_lasthash(blk->bp, &count);
|
|
if (count == 0)
|
|
return;
|
|
break;
|
|
case XFS_DA_NODE_MAGIC:
|
|
lasthash = xfs_da_node_lasthash(blk->bp, &count);
|
|
if (count == 0)
|
|
return;
|
|
break;
|
|
}
|
|
for (blk--, level--; level >= 0; blk--, level--) {
|
|
node = blk->bp->data;
|
|
ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
btree = &node->btree[ blk->index ];
|
|
if (be32_to_cpu(btree->hashval) == lasthash)
|
|
break;
|
|
blk->hashval = lasthash;
|
|
btree->hashval = cpu_to_be32(lasthash);
|
|
xfs_da_log_buf(state->args->trans, blk->bp,
|
|
XFS_DA_LOGRANGE(node, btree, sizeof(*btree)));
|
|
|
|
lasthash = be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1].hashval);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove an entry from an intermediate node.
|
|
*/
|
|
STATIC void
|
|
xfs_da_node_remove(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk)
|
|
{
|
|
xfs_da_intnode_t *node;
|
|
xfs_da_node_entry_t *btree;
|
|
int tmp;
|
|
|
|
node = drop_blk->bp->data;
|
|
ASSERT(drop_blk->index < be16_to_cpu(node->hdr.count));
|
|
ASSERT(drop_blk->index >= 0);
|
|
|
|
/*
|
|
* Copy over the offending entry, or just zero it out.
|
|
*/
|
|
btree = &node->btree[drop_blk->index];
|
|
if (drop_blk->index < (be16_to_cpu(node->hdr.count)-1)) {
|
|
tmp = be16_to_cpu(node->hdr.count) - drop_blk->index - 1;
|
|
tmp *= (uint)sizeof(xfs_da_node_entry_t);
|
|
memmove(btree, btree + 1, tmp);
|
|
xfs_da_log_buf(state->args->trans, drop_blk->bp,
|
|
XFS_DA_LOGRANGE(node, btree, tmp));
|
|
btree = &node->btree[be16_to_cpu(node->hdr.count)-1];
|
|
}
|
|
memset((char *)btree, 0, sizeof(xfs_da_node_entry_t));
|
|
xfs_da_log_buf(state->args->trans, drop_blk->bp,
|
|
XFS_DA_LOGRANGE(node, btree, sizeof(*btree)));
|
|
be16_add_cpu(&node->hdr.count, -1);
|
|
xfs_da_log_buf(state->args->trans, drop_blk->bp,
|
|
XFS_DA_LOGRANGE(node, &node->hdr, sizeof(node->hdr)));
|
|
|
|
/*
|
|
* Copy the last hash value from the block to propagate upwards.
|
|
*/
|
|
btree--;
|
|
drop_blk->hashval = be32_to_cpu(btree->hashval);
|
|
}
|
|
|
|
/*
|
|
* Unbalance the btree elements between two intermediate nodes,
|
|
* move all Btree elements from one node into another.
|
|
*/
|
|
STATIC void
|
|
xfs_da_node_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
|
|
xfs_da_state_blk_t *save_blk)
|
|
{
|
|
xfs_da_intnode_t *drop_node, *save_node;
|
|
xfs_da_node_entry_t *btree;
|
|
int tmp;
|
|
xfs_trans_t *tp;
|
|
|
|
drop_node = drop_blk->bp->data;
|
|
save_node = save_blk->bp->data;
|
|
ASSERT(be16_to_cpu(drop_node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
ASSERT(be16_to_cpu(save_node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
tp = state->args->trans;
|
|
|
|
/*
|
|
* If the dying block has lower hashvals, then move all the
|
|
* elements in the remaining block up to make a hole.
|
|
*/
|
|
if ((be32_to_cpu(drop_node->btree[0].hashval) < be32_to_cpu(save_node->btree[ 0 ].hashval)) ||
|
|
(be32_to_cpu(drop_node->btree[be16_to_cpu(drop_node->hdr.count)-1].hashval) <
|
|
be32_to_cpu(save_node->btree[be16_to_cpu(save_node->hdr.count)-1].hashval)))
|
|
{
|
|
btree = &save_node->btree[be16_to_cpu(drop_node->hdr.count)];
|
|
tmp = be16_to_cpu(save_node->hdr.count) * (uint)sizeof(xfs_da_node_entry_t);
|
|
memmove(btree, &save_node->btree[0], tmp);
|
|
btree = &save_node->btree[0];
|
|
xfs_da_log_buf(tp, save_blk->bp,
|
|
XFS_DA_LOGRANGE(save_node, btree,
|
|
(be16_to_cpu(save_node->hdr.count) + be16_to_cpu(drop_node->hdr.count)) *
|
|
sizeof(xfs_da_node_entry_t)));
|
|
} else {
|
|
btree = &save_node->btree[be16_to_cpu(save_node->hdr.count)];
|
|
xfs_da_log_buf(tp, save_blk->bp,
|
|
XFS_DA_LOGRANGE(save_node, btree,
|
|
be16_to_cpu(drop_node->hdr.count) *
|
|
sizeof(xfs_da_node_entry_t)));
|
|
}
|
|
|
|
/*
|
|
* Move all the B-tree elements from drop_blk to save_blk.
|
|
*/
|
|
tmp = be16_to_cpu(drop_node->hdr.count) * (uint)sizeof(xfs_da_node_entry_t);
|
|
memcpy(btree, &drop_node->btree[0], tmp);
|
|
be16_add_cpu(&save_node->hdr.count, be16_to_cpu(drop_node->hdr.count));
|
|
|
|
xfs_da_log_buf(tp, save_blk->bp,
|
|
XFS_DA_LOGRANGE(save_node, &save_node->hdr,
|
|
sizeof(save_node->hdr)));
|
|
|
|
/*
|
|
* Save the last hashval in the remaining block for upward propagation.
|
|
*/
|
|
save_blk->hashval = be32_to_cpu(save_node->btree[be16_to_cpu(save_node->hdr.count)-1].hashval);
|
|
}
|
|
|
|
/*========================================================================
|
|
* Routines used for finding things in the Btree.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Walk down the Btree looking for a particular filename, filling
|
|
* in the state structure as we go.
|
|
*
|
|
* We will set the state structure to point to each of the elements
|
|
* in each of the nodes where either the hashval is or should be.
|
|
*
|
|
* We support duplicate hashval's so for each entry in the current
|
|
* node that could contain the desired hashval, descend. This is a
|
|
* pruned depth-first tree search.
|
|
*/
|
|
int /* error */
|
|
xfs_da_node_lookup_int(xfs_da_state_t *state, int *result)
|
|
{
|
|
xfs_da_state_blk_t *blk;
|
|
xfs_da_blkinfo_t *curr;
|
|
xfs_da_intnode_t *node;
|
|
xfs_da_node_entry_t *btree;
|
|
xfs_dablk_t blkno;
|
|
int probe, span, max, error, retval;
|
|
xfs_dahash_t hashval, btreehashval;
|
|
xfs_da_args_t *args;
|
|
|
|
args = state->args;
|
|
|
|
/*
|
|
* Descend thru the B-tree searching each level for the right
|
|
* node to use, until the right hashval is found.
|
|
*/
|
|
blkno = (args->whichfork == XFS_DATA_FORK)? state->mp->m_dirleafblk : 0;
|
|
for (blk = &state->path.blk[0], state->path.active = 1;
|
|
state->path.active <= XFS_DA_NODE_MAXDEPTH;
|
|
blk++, state->path.active++) {
|
|
/*
|
|
* Read the next node down in the tree.
|
|
*/
|
|
blk->blkno = blkno;
|
|
error = xfs_da_read_buf(args->trans, args->dp, blkno,
|
|
-1, &blk->bp, args->whichfork);
|
|
if (error) {
|
|
blk->blkno = 0;
|
|
state->path.active--;
|
|
return(error);
|
|
}
|
|
curr = blk->bp->data;
|
|
blk->magic = be16_to_cpu(curr->magic);
|
|
ASSERT(blk->magic == XFS_DA_NODE_MAGIC ||
|
|
blk->magic == XFS_DIR2_LEAFN_MAGIC ||
|
|
blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
|
|
/*
|
|
* Search an intermediate node for a match.
|
|
*/
|
|
if (blk->magic == XFS_DA_NODE_MAGIC) {
|
|
node = blk->bp->data;
|
|
max = be16_to_cpu(node->hdr.count);
|
|
blk->hashval = be32_to_cpu(node->btree[max-1].hashval);
|
|
|
|
/*
|
|
* Binary search. (note: small blocks will skip loop)
|
|
*/
|
|
probe = span = max / 2;
|
|
hashval = args->hashval;
|
|
for (btree = &node->btree[probe]; span > 4;
|
|
btree = &node->btree[probe]) {
|
|
span /= 2;
|
|
btreehashval = be32_to_cpu(btree->hashval);
|
|
if (btreehashval < hashval)
|
|
probe += span;
|
|
else if (btreehashval > hashval)
|
|
probe -= span;
|
|
else
|
|
break;
|
|
}
|
|
ASSERT((probe >= 0) && (probe < max));
|
|
ASSERT((span <= 4) || (be32_to_cpu(btree->hashval) == hashval));
|
|
|
|
/*
|
|
* Since we may have duplicate hashval's, find the first
|
|
* matching hashval in the node.
|
|
*/
|
|
while ((probe > 0) && (be32_to_cpu(btree->hashval) >= hashval)) {
|
|
btree--;
|
|
probe--;
|
|
}
|
|
while ((probe < max) && (be32_to_cpu(btree->hashval) < hashval)) {
|
|
btree++;
|
|
probe++;
|
|
}
|
|
|
|
/*
|
|
* Pick the right block to descend on.
|
|
*/
|
|
if (probe == max) {
|
|
blk->index = max-1;
|
|
blkno = be32_to_cpu(node->btree[max-1].before);
|
|
} else {
|
|
blk->index = probe;
|
|
blkno = be32_to_cpu(btree->before);
|
|
}
|
|
} else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
|
|
blk->hashval = xfs_attr_leaf_lasthash(blk->bp, NULL);
|
|
break;
|
|
} else if (blk->magic == XFS_DIR2_LEAFN_MAGIC) {
|
|
blk->hashval = xfs_dir2_leafn_lasthash(blk->bp, NULL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* A leaf block that ends in the hashval that we are interested in
|
|
* (final hashval == search hashval) means that the next block may
|
|
* contain more entries with the same hashval, shift upward to the
|
|
* next leaf and keep searching.
|
|
*/
|
|
for (;;) {
|
|
if (blk->magic == XFS_DIR2_LEAFN_MAGIC) {
|
|
retval = xfs_dir2_leafn_lookup_int(blk->bp, args,
|
|
&blk->index, state);
|
|
} else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
|
|
retval = xfs_attr_leaf_lookup_int(blk->bp, args);
|
|
blk->index = args->index;
|
|
args->blkno = blk->blkno;
|
|
} else {
|
|
ASSERT(0);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
if (((retval == ENOENT) || (retval == ENOATTR)) &&
|
|
(blk->hashval == args->hashval)) {
|
|
error = xfs_da_path_shift(state, &state->path, 1, 1,
|
|
&retval);
|
|
if (error)
|
|
return(error);
|
|
if (retval == 0) {
|
|
continue;
|
|
} else if (blk->magic == XFS_ATTR_LEAF_MAGIC) {
|
|
/* path_shift() gives ENOENT */
|
|
retval = XFS_ERROR(ENOATTR);
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
*result = retval;
|
|
return(0);
|
|
}
|
|
|
|
/*========================================================================
|
|
* Utility routines.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Link a new block into a doubly linked list of blocks (of whatever type).
|
|
*/
|
|
int /* error */
|
|
xfs_da_blk_link(xfs_da_state_t *state, xfs_da_state_blk_t *old_blk,
|
|
xfs_da_state_blk_t *new_blk)
|
|
{
|
|
xfs_da_blkinfo_t *old_info, *new_info, *tmp_info;
|
|
xfs_da_args_t *args;
|
|
int before=0, error;
|
|
xfs_dabuf_t *bp;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
old_info = old_blk->bp->data;
|
|
new_info = new_blk->bp->data;
|
|
ASSERT(old_blk->magic == XFS_DA_NODE_MAGIC ||
|
|
old_blk->magic == XFS_DIR2_LEAFN_MAGIC ||
|
|
old_blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
ASSERT(old_blk->magic == be16_to_cpu(old_info->magic));
|
|
ASSERT(new_blk->magic == be16_to_cpu(new_info->magic));
|
|
ASSERT(old_blk->magic == new_blk->magic);
|
|
|
|
switch (old_blk->magic) {
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
before = xfs_attr_leaf_order(old_blk->bp, new_blk->bp);
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
before = xfs_dir2_leafn_order(old_blk->bp, new_blk->bp);
|
|
break;
|
|
case XFS_DA_NODE_MAGIC:
|
|
before = xfs_da_node_order(old_blk->bp, new_blk->bp);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Link blocks in appropriate order.
|
|
*/
|
|
if (before) {
|
|
/*
|
|
* Link new block in before existing block.
|
|
*/
|
|
new_info->forw = cpu_to_be32(old_blk->blkno);
|
|
new_info->back = old_info->back;
|
|
if (old_info->back) {
|
|
error = xfs_da_read_buf(args->trans, args->dp,
|
|
be32_to_cpu(old_info->back),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->data;
|
|
ASSERT(be16_to_cpu(tmp_info->magic) == be16_to_cpu(old_info->magic));
|
|
ASSERT(be32_to_cpu(tmp_info->forw) == old_blk->blkno);
|
|
tmp_info->forw = cpu_to_be32(new_blk->blkno);
|
|
xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
|
|
xfs_da_buf_done(bp);
|
|
}
|
|
old_info->back = cpu_to_be32(new_blk->blkno);
|
|
} else {
|
|
/*
|
|
* Link new block in after existing block.
|
|
*/
|
|
new_info->forw = old_info->forw;
|
|
new_info->back = cpu_to_be32(old_blk->blkno);
|
|
if (old_info->forw) {
|
|
error = xfs_da_read_buf(args->trans, args->dp,
|
|
be32_to_cpu(old_info->forw),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->data;
|
|
ASSERT(tmp_info->magic == old_info->magic);
|
|
ASSERT(be32_to_cpu(tmp_info->back) == old_blk->blkno);
|
|
tmp_info->back = cpu_to_be32(new_blk->blkno);
|
|
xfs_da_log_buf(args->trans, bp, 0, sizeof(*tmp_info)-1);
|
|
xfs_da_buf_done(bp);
|
|
}
|
|
old_info->forw = cpu_to_be32(new_blk->blkno);
|
|
}
|
|
|
|
xfs_da_log_buf(args->trans, old_blk->bp, 0, sizeof(*tmp_info) - 1);
|
|
xfs_da_log_buf(args->trans, new_blk->bp, 0, sizeof(*tmp_info) - 1);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Compare two intermediate nodes for "order".
|
|
*/
|
|
STATIC int
|
|
xfs_da_node_order(xfs_dabuf_t *node1_bp, xfs_dabuf_t *node2_bp)
|
|
{
|
|
xfs_da_intnode_t *node1, *node2;
|
|
|
|
node1 = node1_bp->data;
|
|
node2 = node2_bp->data;
|
|
ASSERT((be16_to_cpu(node1->hdr.info.magic) == XFS_DA_NODE_MAGIC) &&
|
|
(be16_to_cpu(node2->hdr.info.magic) == XFS_DA_NODE_MAGIC));
|
|
if ((be16_to_cpu(node1->hdr.count) > 0) && (be16_to_cpu(node2->hdr.count) > 0) &&
|
|
((be32_to_cpu(node2->btree[0].hashval) <
|
|
be32_to_cpu(node1->btree[0].hashval)) ||
|
|
(be32_to_cpu(node2->btree[be16_to_cpu(node2->hdr.count)-1].hashval) <
|
|
be32_to_cpu(node1->btree[be16_to_cpu(node1->hdr.count)-1].hashval)))) {
|
|
return(1);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Pick up the last hashvalue from an intermediate node.
|
|
*/
|
|
STATIC uint
|
|
xfs_da_node_lasthash(xfs_dabuf_t *bp, int *count)
|
|
{
|
|
xfs_da_intnode_t *node;
|
|
|
|
node = bp->data;
|
|
ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
if (count)
|
|
*count = be16_to_cpu(node->hdr.count);
|
|
if (!node->hdr.count)
|
|
return(0);
|
|
return be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1].hashval);
|
|
}
|
|
|
|
/*
|
|
* Unlink a block from a doubly linked list of blocks.
|
|
*/
|
|
STATIC int /* error */
|
|
xfs_da_blk_unlink(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
|
|
xfs_da_state_blk_t *save_blk)
|
|
{
|
|
xfs_da_blkinfo_t *drop_info, *save_info, *tmp_info;
|
|
xfs_da_args_t *args;
|
|
xfs_dabuf_t *bp;
|
|
int error;
|
|
|
|
/*
|
|
* Set up environment.
|
|
*/
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
save_info = save_blk->bp->data;
|
|
drop_info = drop_blk->bp->data;
|
|
ASSERT(save_blk->magic == XFS_DA_NODE_MAGIC ||
|
|
save_blk->magic == XFS_DIR2_LEAFN_MAGIC ||
|
|
save_blk->magic == XFS_ATTR_LEAF_MAGIC);
|
|
ASSERT(save_blk->magic == be16_to_cpu(save_info->magic));
|
|
ASSERT(drop_blk->magic == be16_to_cpu(drop_info->magic));
|
|
ASSERT(save_blk->magic == drop_blk->magic);
|
|
ASSERT((be32_to_cpu(save_info->forw) == drop_blk->blkno) ||
|
|
(be32_to_cpu(save_info->back) == drop_blk->blkno));
|
|
ASSERT((be32_to_cpu(drop_info->forw) == save_blk->blkno) ||
|
|
(be32_to_cpu(drop_info->back) == save_blk->blkno));
|
|
|
|
/*
|
|
* Unlink the leaf block from the doubly linked chain of leaves.
|
|
*/
|
|
if (be32_to_cpu(save_info->back) == drop_blk->blkno) {
|
|
save_info->back = drop_info->back;
|
|
if (drop_info->back) {
|
|
error = xfs_da_read_buf(args->trans, args->dp,
|
|
be32_to_cpu(drop_info->back),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->data;
|
|
ASSERT(tmp_info->magic == save_info->magic);
|
|
ASSERT(be32_to_cpu(tmp_info->forw) == drop_blk->blkno);
|
|
tmp_info->forw = cpu_to_be32(save_blk->blkno);
|
|
xfs_da_log_buf(args->trans, bp, 0,
|
|
sizeof(*tmp_info) - 1);
|
|
xfs_da_buf_done(bp);
|
|
}
|
|
} else {
|
|
save_info->forw = drop_info->forw;
|
|
if (drop_info->forw) {
|
|
error = xfs_da_read_buf(args->trans, args->dp,
|
|
be32_to_cpu(drop_info->forw),
|
|
-1, &bp, args->whichfork);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(bp != NULL);
|
|
tmp_info = bp->data;
|
|
ASSERT(tmp_info->magic == save_info->magic);
|
|
ASSERT(be32_to_cpu(tmp_info->back) == drop_blk->blkno);
|
|
tmp_info->back = cpu_to_be32(save_blk->blkno);
|
|
xfs_da_log_buf(args->trans, bp, 0,
|
|
sizeof(*tmp_info) - 1);
|
|
xfs_da_buf_done(bp);
|
|
}
|
|
}
|
|
|
|
xfs_da_log_buf(args->trans, save_blk->bp, 0, sizeof(*save_info) - 1);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Move a path "forward" or "!forward" one block at the current level.
|
|
*
|
|
* This routine will adjust a "path" to point to the next block
|
|
* "forward" (higher hashvalues) or "!forward" (lower hashvals) in the
|
|
* Btree, including updating pointers to the intermediate nodes between
|
|
* the new bottom and the root.
|
|
*/
|
|
int /* error */
|
|
xfs_da_path_shift(xfs_da_state_t *state, xfs_da_state_path_t *path,
|
|
int forward, int release, int *result)
|
|
{
|
|
xfs_da_state_blk_t *blk;
|
|
xfs_da_blkinfo_t *info;
|
|
xfs_da_intnode_t *node;
|
|
xfs_da_args_t *args;
|
|
xfs_dablk_t blkno=0;
|
|
int level, error;
|
|
|
|
/*
|
|
* Roll up the Btree looking for the first block where our
|
|
* current index is not at the edge of the block. Note that
|
|
* we skip the bottom layer because we want the sibling block.
|
|
*/
|
|
args = state->args;
|
|
ASSERT(args != NULL);
|
|
ASSERT(path != NULL);
|
|
ASSERT((path->active > 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
|
|
level = (path->active-1) - 1; /* skip bottom layer in path */
|
|
for (blk = &path->blk[level]; level >= 0; blk--, level--) {
|
|
ASSERT(blk->bp != NULL);
|
|
node = blk->bp->data;
|
|
ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);
|
|
if (forward && (blk->index < be16_to_cpu(node->hdr.count)-1)) {
|
|
blk->index++;
|
|
blkno = be32_to_cpu(node->btree[blk->index].before);
|
|
break;
|
|
} else if (!forward && (blk->index > 0)) {
|
|
blk->index--;
|
|
blkno = be32_to_cpu(node->btree[blk->index].before);
|
|
break;
|
|
}
|
|
}
|
|
if (level < 0) {
|
|
*result = XFS_ERROR(ENOENT); /* we're out of our tree */
|
|
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Roll down the edge of the subtree until we reach the
|
|
* same depth we were at originally.
|
|
*/
|
|
for (blk++, level++; level < path->active; blk++, level++) {
|
|
/*
|
|
* Release the old block.
|
|
* (if it's dirty, trans won't actually let go)
|
|
*/
|
|
if (release)
|
|
xfs_da_brelse(args->trans, blk->bp);
|
|
|
|
/*
|
|
* Read the next child block.
|
|
*/
|
|
blk->blkno = blkno;
|
|
error = xfs_da_read_buf(args->trans, args->dp, blkno, -1,
|
|
&blk->bp, args->whichfork);
|
|
if (error)
|
|
return(error);
|
|
ASSERT(blk->bp != NULL);
|
|
info = blk->bp->data;
|
|
ASSERT(be16_to_cpu(info->magic) == XFS_DA_NODE_MAGIC ||
|
|
be16_to_cpu(info->magic) == XFS_DIR2_LEAFN_MAGIC ||
|
|
be16_to_cpu(info->magic) == XFS_ATTR_LEAF_MAGIC);
|
|
blk->magic = be16_to_cpu(info->magic);
|
|
if (blk->magic == XFS_DA_NODE_MAGIC) {
|
|
node = (xfs_da_intnode_t *)info;
|
|
blk->hashval = be32_to_cpu(node->btree[be16_to_cpu(node->hdr.count)-1].hashval);
|
|
if (forward)
|
|
blk->index = 0;
|
|
else
|
|
blk->index = be16_to_cpu(node->hdr.count)-1;
|
|
blkno = be32_to_cpu(node->btree[blk->index].before);
|
|
} else {
|
|
ASSERT(level == path->active-1);
|
|
blk->index = 0;
|
|
switch(blk->magic) {
|
|
case XFS_ATTR_LEAF_MAGIC:
|
|
blk->hashval = xfs_attr_leaf_lasthash(blk->bp,
|
|
NULL);
|
|
break;
|
|
case XFS_DIR2_LEAFN_MAGIC:
|
|
blk->hashval = xfs_dir2_leafn_lasthash(blk->bp,
|
|
NULL);
|
|
break;
|
|
default:
|
|
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC ||
|
|
blk->magic == XFS_DIR2_LEAFN_MAGIC);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
*result = 0;
|
|
return(0);
|
|
}
|
|
|
|
|
|
/*========================================================================
|
|
* Utility routines.
|
|
*========================================================================*/
|
|
|
|
/*
|
|
* Implement a simple hash on a character string.
|
|
* Rotate the hash value by 7 bits, then XOR each character in.
|
|
* This is implemented with some source-level loop unrolling.
|
|
*/
|
|
xfs_dahash_t
|
|
xfs_da_hashname(const __uint8_t *name, int namelen)
|
|
{
|
|
xfs_dahash_t hash;
|
|
|
|
/*
|
|
* Do four characters at a time as long as we can.
|
|
*/
|
|
for (hash = 0; namelen >= 4; namelen -= 4, name += 4)
|
|
hash = (name[0] << 21) ^ (name[1] << 14) ^ (name[2] << 7) ^
|
|
(name[3] << 0) ^ rol32(hash, 7 * 4);
|
|
|
|
/*
|
|
* Now do the rest of the characters.
|
|
*/
|
|
switch (namelen) {
|
|
case 3:
|
|
return (name[0] << 14) ^ (name[1] << 7) ^ (name[2] << 0) ^
|
|
rol32(hash, 7 * 3);
|
|
case 2:
|
|
return (name[0] << 7) ^ (name[1] << 0) ^ rol32(hash, 7 * 2);
|
|
case 1:
|
|
return (name[0] << 0) ^ rol32(hash, 7 * 1);
|
|
default: /* case 0: */
|
|
return hash;
|
|
}
|
|
}
|
|
|
|
enum xfs_dacmp
|
|
xfs_da_compname(
|
|
struct xfs_da_args *args,
|
|
const char *name,
|
|
int len)
|
|
{
|
|
return (args->namelen == len && memcmp(args->name, name, len) == 0) ?
|
|
XFS_CMP_EXACT : XFS_CMP_DIFFERENT;
|
|
}
|
|
|
|
static xfs_dahash_t
|
|
xfs_default_hashname(
|
|
struct xfs_name *name)
|
|
{
|
|
return xfs_da_hashname(name->name, name->len);
|
|
}
|
|
|
|
const struct xfs_nameops xfs_default_nameops = {
|
|
.hashname = xfs_default_hashname,
|
|
.compname = xfs_da_compname
|
|
};
|
|
|
|
/*
|
|
* Add a block to the btree ahead of the file.
|
|
* Return the new block number to the caller.
|
|
*/
|
|
int
|
|
xfs_da_grow_inode(xfs_da_args_t *args, xfs_dablk_t *new_blkno)
|
|
{
|
|
xfs_fileoff_t bno, b;
|
|
xfs_bmbt_irec_t map;
|
|
xfs_bmbt_irec_t *mapp;
|
|
xfs_inode_t *dp;
|
|
int nmap, error, w, count, c, got, i, mapi;
|
|
xfs_trans_t *tp;
|
|
xfs_mount_t *mp;
|
|
xfs_drfsbno_t nblks;
|
|
|
|
dp = args->dp;
|
|
mp = dp->i_mount;
|
|
w = args->whichfork;
|
|
tp = args->trans;
|
|
nblks = dp->i_d.di_nblocks;
|
|
|
|
/*
|
|
* For new directories adjust the file offset and block count.
|
|
*/
|
|
if (w == XFS_DATA_FORK) {
|
|
bno = mp->m_dirleafblk;
|
|
count = mp->m_dirblkfsbs;
|
|
} else {
|
|
bno = 0;
|
|
count = 1;
|
|
}
|
|
/*
|
|
* Find a spot in the file space to put the new block.
|
|
*/
|
|
if ((error = xfs_bmap_first_unused(tp, dp, count, &bno, w)))
|
|
return error;
|
|
if (w == XFS_DATA_FORK)
|
|
ASSERT(bno >= mp->m_dirleafblk && bno < mp->m_dirfreeblk);
|
|
/*
|
|
* Try mapping it in one filesystem block.
|
|
*/
|
|
nmap = 1;
|
|
ASSERT(args->firstblock != NULL);
|
|
if ((error = xfs_bmapi(tp, dp, bno, count,
|
|
xfs_bmapi_aflag(w)|XFS_BMAPI_WRITE|XFS_BMAPI_METADATA|
|
|
XFS_BMAPI_CONTIG,
|
|
args->firstblock, args->total, &map, &nmap,
|
|
args->flist, NULL))) {
|
|
return error;
|
|
}
|
|
ASSERT(nmap <= 1);
|
|
if (nmap == 1) {
|
|
mapp = ↦
|
|
mapi = 1;
|
|
}
|
|
/*
|
|
* If we didn't get it and the block might work if fragmented,
|
|
* try without the CONTIG flag. Loop until we get it all.
|
|
*/
|
|
else if (nmap == 0 && count > 1) {
|
|
mapp = kmem_alloc(sizeof(*mapp) * count, KM_SLEEP);
|
|
for (b = bno, mapi = 0; b < bno + count; ) {
|
|
nmap = MIN(XFS_BMAP_MAX_NMAP, count);
|
|
c = (int)(bno + count - b);
|
|
if ((error = xfs_bmapi(tp, dp, b, c,
|
|
xfs_bmapi_aflag(w)|XFS_BMAPI_WRITE|
|
|
XFS_BMAPI_METADATA,
|
|
args->firstblock, args->total,
|
|
&mapp[mapi], &nmap, args->flist,
|
|
NULL))) {
|
|
kmem_free(mapp);
|
|
return error;
|
|
}
|
|
if (nmap < 1)
|
|
break;
|
|
mapi += nmap;
|
|
b = mapp[mapi - 1].br_startoff +
|
|
mapp[mapi - 1].br_blockcount;
|
|
}
|
|
} else {
|
|
mapi = 0;
|
|
mapp = NULL;
|
|
}
|
|
/*
|
|
* Count the blocks we got, make sure it matches the total.
|
|
*/
|
|
for (i = 0, got = 0; i < mapi; i++)
|
|
got += mapp[i].br_blockcount;
|
|
if (got != count || mapp[0].br_startoff != bno ||
|
|
mapp[mapi - 1].br_startoff + mapp[mapi - 1].br_blockcount !=
|
|
bno + count) {
|
|
if (mapp != &map)
|
|
kmem_free(mapp);
|
|
return XFS_ERROR(ENOSPC);
|
|
}
|
|
if (mapp != &map)
|
|
kmem_free(mapp);
|
|
/* account for newly allocated blocks in reserved blocks total */
|
|
args->total -= dp->i_d.di_nblocks - nblks;
|
|
*new_blkno = (xfs_dablk_t)bno;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Ick. We need to always be able to remove a btree block, even
|
|
* if there's no space reservation because the filesystem is full.
|
|
* This is called if xfs_bunmapi on a btree block fails due to ENOSPC.
|
|
* It swaps the target block with the last block in the file. The
|
|
* last block in the file can always be removed since it can't cause
|
|
* a bmap btree split to do that.
|
|
*/
|
|
STATIC int
|
|
xfs_da_swap_lastblock(xfs_da_args_t *args, xfs_dablk_t *dead_blknop,
|
|
xfs_dabuf_t **dead_bufp)
|
|
{
|
|
xfs_dablk_t dead_blkno, last_blkno, sib_blkno, par_blkno;
|
|
xfs_dabuf_t *dead_buf, *last_buf, *sib_buf, *par_buf;
|
|
xfs_fileoff_t lastoff;
|
|
xfs_inode_t *ip;
|
|
xfs_trans_t *tp;
|
|
xfs_mount_t *mp;
|
|
int error, w, entno, level, dead_level;
|
|
xfs_da_blkinfo_t *dead_info, *sib_info;
|
|
xfs_da_intnode_t *par_node, *dead_node;
|
|
xfs_dir2_leaf_t *dead_leaf2;
|
|
xfs_dahash_t dead_hash;
|
|
|
|
dead_buf = *dead_bufp;
|
|
dead_blkno = *dead_blknop;
|
|
tp = args->trans;
|
|
ip = args->dp;
|
|
w = args->whichfork;
|
|
ASSERT(w == XFS_DATA_FORK);
|
|
mp = ip->i_mount;
|
|
lastoff = mp->m_dirfreeblk;
|
|
error = xfs_bmap_last_before(tp, ip, &lastoff, w);
|
|
if (error)
|
|
return error;
|
|
if (unlikely(lastoff == 0)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(1)", XFS_ERRLEVEL_LOW,
|
|
mp);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
/*
|
|
* Read the last block in the btree space.
|
|
*/
|
|
last_blkno = (xfs_dablk_t)lastoff - mp->m_dirblkfsbs;
|
|
if ((error = xfs_da_read_buf(tp, ip, last_blkno, -1, &last_buf, w)))
|
|
return error;
|
|
/*
|
|
* Copy the last block into the dead buffer and log it.
|
|
*/
|
|
memcpy(dead_buf->data, last_buf->data, mp->m_dirblksize);
|
|
xfs_da_log_buf(tp, dead_buf, 0, mp->m_dirblksize - 1);
|
|
dead_info = dead_buf->data;
|
|
/*
|
|
* Get values from the moved block.
|
|
*/
|
|
if (be16_to_cpu(dead_info->magic) == XFS_DIR2_LEAFN_MAGIC) {
|
|
dead_leaf2 = (xfs_dir2_leaf_t *)dead_info;
|
|
dead_level = 0;
|
|
dead_hash = be32_to_cpu(dead_leaf2->ents[be16_to_cpu(dead_leaf2->hdr.count) - 1].hashval);
|
|
} else {
|
|
ASSERT(be16_to_cpu(dead_info->magic) == XFS_DA_NODE_MAGIC);
|
|
dead_node = (xfs_da_intnode_t *)dead_info;
|
|
dead_level = be16_to_cpu(dead_node->hdr.level);
|
|
dead_hash = be32_to_cpu(dead_node->btree[be16_to_cpu(dead_node->hdr.count) - 1].hashval);
|
|
}
|
|
sib_buf = par_buf = NULL;
|
|
/*
|
|
* If the moved block has a left sibling, fix up the pointers.
|
|
*/
|
|
if ((sib_blkno = be32_to_cpu(dead_info->back))) {
|
|
if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w)))
|
|
goto done;
|
|
sib_info = sib_buf->data;
|
|
if (unlikely(
|
|
be32_to_cpu(sib_info->forw) != last_blkno ||
|
|
sib_info->magic != dead_info->magic)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(2)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = XFS_ERROR(EFSCORRUPTED);
|
|
goto done;
|
|
}
|
|
sib_info->forw = cpu_to_be32(dead_blkno);
|
|
xfs_da_log_buf(tp, sib_buf,
|
|
XFS_DA_LOGRANGE(sib_info, &sib_info->forw,
|
|
sizeof(sib_info->forw)));
|
|
xfs_da_buf_done(sib_buf);
|
|
sib_buf = NULL;
|
|
}
|
|
/*
|
|
* If the moved block has a right sibling, fix up the pointers.
|
|
*/
|
|
if ((sib_blkno = be32_to_cpu(dead_info->forw))) {
|
|
if ((error = xfs_da_read_buf(tp, ip, sib_blkno, -1, &sib_buf, w)))
|
|
goto done;
|
|
sib_info = sib_buf->data;
|
|
if (unlikely(
|
|
be32_to_cpu(sib_info->back) != last_blkno ||
|
|
sib_info->magic != dead_info->magic)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(3)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = XFS_ERROR(EFSCORRUPTED);
|
|
goto done;
|
|
}
|
|
sib_info->back = cpu_to_be32(dead_blkno);
|
|
xfs_da_log_buf(tp, sib_buf,
|
|
XFS_DA_LOGRANGE(sib_info, &sib_info->back,
|
|
sizeof(sib_info->back)));
|
|
xfs_da_buf_done(sib_buf);
|
|
sib_buf = NULL;
|
|
}
|
|
par_blkno = mp->m_dirleafblk;
|
|
level = -1;
|
|
/*
|
|
* Walk down the tree looking for the parent of the moved block.
|
|
*/
|
|
for (;;) {
|
|
if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w)))
|
|
goto done;
|
|
par_node = par_buf->data;
|
|
if (unlikely(
|
|
be16_to_cpu(par_node->hdr.info.magic) != XFS_DA_NODE_MAGIC ||
|
|
(level >= 0 && level != be16_to_cpu(par_node->hdr.level) + 1))) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(4)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = XFS_ERROR(EFSCORRUPTED);
|
|
goto done;
|
|
}
|
|
level = be16_to_cpu(par_node->hdr.level);
|
|
for (entno = 0;
|
|
entno < be16_to_cpu(par_node->hdr.count) &&
|
|
be32_to_cpu(par_node->btree[entno].hashval) < dead_hash;
|
|
entno++)
|
|
continue;
|
|
if (unlikely(entno == be16_to_cpu(par_node->hdr.count))) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(5)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = XFS_ERROR(EFSCORRUPTED);
|
|
goto done;
|
|
}
|
|
par_blkno = be32_to_cpu(par_node->btree[entno].before);
|
|
if (level == dead_level + 1)
|
|
break;
|
|
xfs_da_brelse(tp, par_buf);
|
|
par_buf = NULL;
|
|
}
|
|
/*
|
|
* We're in the right parent block.
|
|
* Look for the right entry.
|
|
*/
|
|
for (;;) {
|
|
for (;
|
|
entno < be16_to_cpu(par_node->hdr.count) &&
|
|
be32_to_cpu(par_node->btree[entno].before) != last_blkno;
|
|
entno++)
|
|
continue;
|
|
if (entno < be16_to_cpu(par_node->hdr.count))
|
|
break;
|
|
par_blkno = be32_to_cpu(par_node->hdr.info.forw);
|
|
xfs_da_brelse(tp, par_buf);
|
|
par_buf = NULL;
|
|
if (unlikely(par_blkno == 0)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(6)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = XFS_ERROR(EFSCORRUPTED);
|
|
goto done;
|
|
}
|
|
if ((error = xfs_da_read_buf(tp, ip, par_blkno, -1, &par_buf, w)))
|
|
goto done;
|
|
par_node = par_buf->data;
|
|
if (unlikely(
|
|
be16_to_cpu(par_node->hdr.level) != level ||
|
|
be16_to_cpu(par_node->hdr.info.magic) != XFS_DA_NODE_MAGIC)) {
|
|
XFS_ERROR_REPORT("xfs_da_swap_lastblock(7)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
error = XFS_ERROR(EFSCORRUPTED);
|
|
goto done;
|
|
}
|
|
entno = 0;
|
|
}
|
|
/*
|
|
* Update the parent entry pointing to the moved block.
|
|
*/
|
|
par_node->btree[entno].before = cpu_to_be32(dead_blkno);
|
|
xfs_da_log_buf(tp, par_buf,
|
|
XFS_DA_LOGRANGE(par_node, &par_node->btree[entno].before,
|
|
sizeof(par_node->btree[entno].before)));
|
|
xfs_da_buf_done(par_buf);
|
|
xfs_da_buf_done(dead_buf);
|
|
*dead_blknop = last_blkno;
|
|
*dead_bufp = last_buf;
|
|
return 0;
|
|
done:
|
|
if (par_buf)
|
|
xfs_da_brelse(tp, par_buf);
|
|
if (sib_buf)
|
|
xfs_da_brelse(tp, sib_buf);
|
|
xfs_da_brelse(tp, last_buf);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Remove a btree block from a directory or attribute.
|
|
*/
|
|
int
|
|
xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno,
|
|
xfs_dabuf_t *dead_buf)
|
|
{
|
|
xfs_inode_t *dp;
|
|
int done, error, w, count;
|
|
xfs_trans_t *tp;
|
|
xfs_mount_t *mp;
|
|
|
|
dp = args->dp;
|
|
w = args->whichfork;
|
|
tp = args->trans;
|
|
mp = dp->i_mount;
|
|
if (w == XFS_DATA_FORK)
|
|
count = mp->m_dirblkfsbs;
|
|
else
|
|
count = 1;
|
|
for (;;) {
|
|
/*
|
|
* Remove extents. If we get ENOSPC for a dir we have to move
|
|
* the last block to the place we want to kill.
|
|
*/
|
|
if ((error = xfs_bunmapi(tp, dp, dead_blkno, count,
|
|
xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA,
|
|
0, args->firstblock, args->flist, NULL,
|
|
&done)) == ENOSPC) {
|
|
if (w != XFS_DATA_FORK)
|
|
break;
|
|
if ((error = xfs_da_swap_lastblock(args, &dead_blkno,
|
|
&dead_buf)))
|
|
break;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
xfs_da_binval(tp, dead_buf);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* See if the mapping(s) for this btree block are valid, i.e.
|
|
* don't contain holes, are logically contiguous, and cover the whole range.
|
|
*/
|
|
STATIC int
|
|
xfs_da_map_covers_blocks(
|
|
int nmap,
|
|
xfs_bmbt_irec_t *mapp,
|
|
xfs_dablk_t bno,
|
|
int count)
|
|
{
|
|
int i;
|
|
xfs_fileoff_t off;
|
|
|
|
for (i = 0, off = bno; i < nmap; i++) {
|
|
if (mapp[i].br_startblock == HOLESTARTBLOCK ||
|
|
mapp[i].br_startblock == DELAYSTARTBLOCK) {
|
|
return 0;
|
|
}
|
|
if (off != mapp[i].br_startoff) {
|
|
return 0;
|
|
}
|
|
off += mapp[i].br_blockcount;
|
|
}
|
|
return off == bno + count;
|
|
}
|
|
|
|
/*
|
|
* Make a dabuf.
|
|
* Used for get_buf, read_buf, read_bufr, and reada_buf.
|
|
*/
|
|
STATIC int
|
|
xfs_da_do_buf(
|
|
xfs_trans_t *trans,
|
|
xfs_inode_t *dp,
|
|
xfs_dablk_t bno,
|
|
xfs_daddr_t *mappedbnop,
|
|
xfs_dabuf_t **bpp,
|
|
int whichfork,
|
|
int caller,
|
|
inst_t *ra)
|
|
{
|
|
xfs_buf_t *bp = NULL;
|
|
xfs_buf_t **bplist;
|
|
int error=0;
|
|
int i;
|
|
xfs_bmbt_irec_t map;
|
|
xfs_bmbt_irec_t *mapp;
|
|
xfs_daddr_t mappedbno;
|
|
xfs_mount_t *mp;
|
|
int nbplist=0;
|
|
int nfsb;
|
|
int nmap;
|
|
xfs_dabuf_t *rbp;
|
|
|
|
mp = dp->i_mount;
|
|
nfsb = (whichfork == XFS_DATA_FORK) ? mp->m_dirblkfsbs : 1;
|
|
mappedbno = *mappedbnop;
|
|
/*
|
|
* Caller doesn't have a mapping. -2 means don't complain
|
|
* if we land in a hole.
|
|
*/
|
|
if (mappedbno == -1 || mappedbno == -2) {
|
|
/*
|
|
* Optimize the one-block case.
|
|
*/
|
|
if (nfsb == 1) {
|
|
xfs_fsblock_t fsb;
|
|
|
|
if ((error =
|
|
xfs_bmapi_single(trans, dp, whichfork, &fsb,
|
|
(xfs_fileoff_t)bno))) {
|
|
return error;
|
|
}
|
|
mapp = ↦
|
|
if (fsb == NULLFSBLOCK) {
|
|
nmap = 0;
|
|
} else {
|
|
map.br_startblock = fsb;
|
|
map.br_startoff = (xfs_fileoff_t)bno;
|
|
map.br_blockcount = 1;
|
|
nmap = 1;
|
|
}
|
|
} else {
|
|
mapp = kmem_alloc(sizeof(*mapp) * nfsb, KM_SLEEP);
|
|
nmap = nfsb;
|
|
if ((error = xfs_bmapi(trans, dp, (xfs_fileoff_t)bno,
|
|
nfsb,
|
|
XFS_BMAPI_METADATA |
|
|
xfs_bmapi_aflag(whichfork),
|
|
NULL, 0, mapp, &nmap, NULL, NULL)))
|
|
goto exit0;
|
|
}
|
|
} else {
|
|
map.br_startblock = XFS_DADDR_TO_FSB(mp, mappedbno);
|
|
map.br_startoff = (xfs_fileoff_t)bno;
|
|
map.br_blockcount = nfsb;
|
|
mapp = ↦
|
|
nmap = 1;
|
|
}
|
|
if (!xfs_da_map_covers_blocks(nmap, mapp, bno, nfsb)) {
|
|
error = mappedbno == -2 ? 0 : XFS_ERROR(EFSCORRUPTED);
|
|
if (unlikely(error == EFSCORRUPTED)) {
|
|
if (xfs_error_level >= XFS_ERRLEVEL_LOW) {
|
|
cmn_err(CE_ALERT, "xfs_da_do_buf: bno %lld\n",
|
|
(long long)bno);
|
|
cmn_err(CE_ALERT, "dir: inode %lld\n",
|
|
(long long)dp->i_ino);
|
|
for (i = 0; i < nmap; i++) {
|
|
cmn_err(CE_ALERT,
|
|
"[%02d] br_startoff %lld br_startblock %lld br_blockcount %lld br_state %d\n",
|
|
i,
|
|
(long long)mapp[i].br_startoff,
|
|
(long long)mapp[i].br_startblock,
|
|
(long long)mapp[i].br_blockcount,
|
|
mapp[i].br_state);
|
|
}
|
|
}
|
|
XFS_ERROR_REPORT("xfs_da_do_buf(1)",
|
|
XFS_ERRLEVEL_LOW, mp);
|
|
}
|
|
goto exit0;
|
|
}
|
|
if (caller != 3 && nmap > 1) {
|
|
bplist = kmem_alloc(sizeof(*bplist) * nmap, KM_SLEEP);
|
|
nbplist = 0;
|
|
} else
|
|
bplist = NULL;
|
|
/*
|
|
* Turn the mapping(s) into buffer(s).
|
|
*/
|
|
for (i = 0; i < nmap; i++) {
|
|
int nmapped;
|
|
|
|
mappedbno = XFS_FSB_TO_DADDR(mp, mapp[i].br_startblock);
|
|
if (i == 0)
|
|
*mappedbnop = mappedbno;
|
|
nmapped = (int)XFS_FSB_TO_BB(mp, mapp[i].br_blockcount);
|
|
switch (caller) {
|
|
case 0:
|
|
bp = xfs_trans_get_buf(trans, mp->m_ddev_targp,
|
|
mappedbno, nmapped, 0);
|
|
error = bp ? XFS_BUF_GETERROR(bp) : XFS_ERROR(EIO);
|
|
break;
|
|
case 1:
|
|
case 2:
|
|
bp = NULL;
|
|
error = xfs_trans_read_buf(mp, trans, mp->m_ddev_targp,
|
|
mappedbno, nmapped, 0, &bp);
|
|
break;
|
|
case 3:
|
|
xfs_baread(mp->m_ddev_targp, mappedbno, nmapped);
|
|
error = 0;
|
|
bp = NULL;
|
|
break;
|
|
}
|
|
if (error) {
|
|
if (bp)
|
|
xfs_trans_brelse(trans, bp);
|
|
goto exit1;
|
|
}
|
|
if (!bp)
|
|
continue;
|
|
if (caller == 1) {
|
|
if (whichfork == XFS_ATTR_FORK) {
|
|
XFS_BUF_SET_VTYPE_REF(bp, B_FS_ATTR_BTREE,
|
|
XFS_ATTR_BTREE_REF);
|
|
} else {
|
|
XFS_BUF_SET_VTYPE_REF(bp, B_FS_DIR_BTREE,
|
|
XFS_DIR_BTREE_REF);
|
|
}
|
|
}
|
|
if (bplist) {
|
|
bplist[nbplist++] = bp;
|
|
}
|
|
}
|
|
/*
|
|
* Build a dabuf structure.
|
|
*/
|
|
if (bplist) {
|
|
rbp = xfs_da_buf_make(nbplist, bplist, ra);
|
|
} else if (bp)
|
|
rbp = xfs_da_buf_make(1, &bp, ra);
|
|
else
|
|
rbp = NULL;
|
|
/*
|
|
* For read_buf, check the magic number.
|
|
*/
|
|
if (caller == 1) {
|
|
xfs_dir2_data_t *data;
|
|
xfs_dir2_free_t *free;
|
|
xfs_da_blkinfo_t *info;
|
|
uint magic, magic1;
|
|
|
|
info = rbp->data;
|
|
data = rbp->data;
|
|
free = rbp->data;
|
|
magic = be16_to_cpu(info->magic);
|
|
magic1 = be32_to_cpu(data->hdr.magic);
|
|
if (unlikely(
|
|
XFS_TEST_ERROR((magic != XFS_DA_NODE_MAGIC) &&
|
|
(magic != XFS_ATTR_LEAF_MAGIC) &&
|
|
(magic != XFS_DIR2_LEAF1_MAGIC) &&
|
|
(magic != XFS_DIR2_LEAFN_MAGIC) &&
|
|
(magic1 != XFS_DIR2_BLOCK_MAGIC) &&
|
|
(magic1 != XFS_DIR2_DATA_MAGIC) &&
|
|
(be32_to_cpu(free->hdr.magic) != XFS_DIR2_FREE_MAGIC),
|
|
mp, XFS_ERRTAG_DA_READ_BUF,
|
|
XFS_RANDOM_DA_READ_BUF))) {
|
|
xfs_buftrace("DA READ ERROR", rbp->bps[0]);
|
|
XFS_CORRUPTION_ERROR("xfs_da_do_buf(2)",
|
|
XFS_ERRLEVEL_LOW, mp, info);
|
|
error = XFS_ERROR(EFSCORRUPTED);
|
|
xfs_da_brelse(trans, rbp);
|
|
nbplist = 0;
|
|
goto exit1;
|
|
}
|
|
}
|
|
if (bplist) {
|
|
kmem_free(bplist);
|
|
}
|
|
if (mapp != &map) {
|
|
kmem_free(mapp);
|
|
}
|
|
if (bpp)
|
|
*bpp = rbp;
|
|
return 0;
|
|
exit1:
|
|
if (bplist) {
|
|
for (i = 0; i < nbplist; i++)
|
|
xfs_trans_brelse(trans, bplist[i]);
|
|
kmem_free(bplist);
|
|
}
|
|
exit0:
|
|
if (mapp != &map)
|
|
kmem_free(mapp);
|
|
if (bpp)
|
|
*bpp = NULL;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Get a buffer for the dir/attr block.
|
|
*/
|
|
int
|
|
xfs_da_get_buf(
|
|
xfs_trans_t *trans,
|
|
xfs_inode_t *dp,
|
|
xfs_dablk_t bno,
|
|
xfs_daddr_t mappedbno,
|
|
xfs_dabuf_t **bpp,
|
|
int whichfork)
|
|
{
|
|
return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 0,
|
|
(inst_t *)__return_address);
|
|
}
|
|
|
|
/*
|
|
* Get a buffer for the dir/attr block, fill in the contents.
|
|
*/
|
|
int
|
|
xfs_da_read_buf(
|
|
xfs_trans_t *trans,
|
|
xfs_inode_t *dp,
|
|
xfs_dablk_t bno,
|
|
xfs_daddr_t mappedbno,
|
|
xfs_dabuf_t **bpp,
|
|
int whichfork)
|
|
{
|
|
return xfs_da_do_buf(trans, dp, bno, &mappedbno, bpp, whichfork, 1,
|
|
(inst_t *)__return_address);
|
|
}
|
|
|
|
/*
|
|
* Readahead the dir/attr block.
|
|
*/
|
|
xfs_daddr_t
|
|
xfs_da_reada_buf(
|
|
xfs_trans_t *trans,
|
|
xfs_inode_t *dp,
|
|
xfs_dablk_t bno,
|
|
int whichfork)
|
|
{
|
|
xfs_daddr_t rval;
|
|
|
|
rval = -1;
|
|
if (xfs_da_do_buf(trans, dp, bno, &rval, NULL, whichfork, 3,
|
|
(inst_t *)__return_address))
|
|
return -1;
|
|
else
|
|
return rval;
|
|
}
|
|
|
|
kmem_zone_t *xfs_da_state_zone; /* anchor for state struct zone */
|
|
kmem_zone_t *xfs_dabuf_zone; /* dabuf zone */
|
|
|
|
/*
|
|
* Allocate a dir-state structure.
|
|
* We don't put them on the stack since they're large.
|
|
*/
|
|
xfs_da_state_t *
|
|
xfs_da_state_alloc(void)
|
|
{
|
|
return kmem_zone_zalloc(xfs_da_state_zone, KM_NOFS);
|
|
}
|
|
|
|
/*
|
|
* Kill the altpath contents of a da-state structure.
|
|
*/
|
|
STATIC void
|
|
xfs_da_state_kill_altpath(xfs_da_state_t *state)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < state->altpath.active; i++) {
|
|
if (state->altpath.blk[i].bp) {
|
|
if (state->altpath.blk[i].bp != state->path.blk[i].bp)
|
|
xfs_da_buf_done(state->altpath.blk[i].bp);
|
|
state->altpath.blk[i].bp = NULL;
|
|
}
|
|
}
|
|
state->altpath.active = 0;
|
|
}
|
|
|
|
/*
|
|
* Free a da-state structure.
|
|
*/
|
|
void
|
|
xfs_da_state_free(xfs_da_state_t *state)
|
|
{
|
|
int i;
|
|
|
|
xfs_da_state_kill_altpath(state);
|
|
for (i = 0; i < state->path.active; i++) {
|
|
if (state->path.blk[i].bp)
|
|
xfs_da_buf_done(state->path.blk[i].bp);
|
|
}
|
|
if (state->extravalid && state->extrablk.bp)
|
|
xfs_da_buf_done(state->extrablk.bp);
|
|
#ifdef DEBUG
|
|
memset((char *)state, 0, sizeof(*state));
|
|
#endif /* DEBUG */
|
|
kmem_zone_free(xfs_da_state_zone, state);
|
|
}
|
|
|
|
#ifdef XFS_DABUF_DEBUG
|
|
xfs_dabuf_t *xfs_dabuf_global_list;
|
|
static DEFINE_SPINLOCK(xfs_dabuf_global_lock);
|
|
#endif
|
|
|
|
/*
|
|
* Create a dabuf.
|
|
*/
|
|
/* ARGSUSED */
|
|
STATIC xfs_dabuf_t *
|
|
xfs_da_buf_make(int nbuf, xfs_buf_t **bps, inst_t *ra)
|
|
{
|
|
xfs_buf_t *bp;
|
|
xfs_dabuf_t *dabuf;
|
|
int i;
|
|
int off;
|
|
|
|
if (nbuf == 1)
|
|
dabuf = kmem_zone_alloc(xfs_dabuf_zone, KM_NOFS);
|
|
else
|
|
dabuf = kmem_alloc(XFS_DA_BUF_SIZE(nbuf), KM_NOFS);
|
|
dabuf->dirty = 0;
|
|
#ifdef XFS_DABUF_DEBUG
|
|
dabuf->ra = ra;
|
|
dabuf->target = XFS_BUF_TARGET(bps[0]);
|
|
dabuf->blkno = XFS_BUF_ADDR(bps[0]);
|
|
#endif
|
|
if (nbuf == 1) {
|
|
dabuf->nbuf = 1;
|
|
bp = bps[0];
|
|
dabuf->bbcount = (short)BTOBB(XFS_BUF_COUNT(bp));
|
|
dabuf->data = XFS_BUF_PTR(bp);
|
|
dabuf->bps[0] = bp;
|
|
} else {
|
|
dabuf->nbuf = nbuf;
|
|
for (i = 0, dabuf->bbcount = 0; i < nbuf; i++) {
|
|
dabuf->bps[i] = bp = bps[i];
|
|
dabuf->bbcount += BTOBB(XFS_BUF_COUNT(bp));
|
|
}
|
|
dabuf->data = kmem_alloc(BBTOB(dabuf->bbcount), KM_SLEEP);
|
|
for (i = off = 0; i < nbuf; i++, off += XFS_BUF_COUNT(bp)) {
|
|
bp = bps[i];
|
|
memcpy((char *)dabuf->data + off, XFS_BUF_PTR(bp),
|
|
XFS_BUF_COUNT(bp));
|
|
}
|
|
}
|
|
#ifdef XFS_DABUF_DEBUG
|
|
{
|
|
xfs_dabuf_t *p;
|
|
|
|
spin_lock(&xfs_dabuf_global_lock);
|
|
for (p = xfs_dabuf_global_list; p; p = p->next) {
|
|
ASSERT(p->blkno != dabuf->blkno ||
|
|
p->target != dabuf->target);
|
|
}
|
|
dabuf->prev = NULL;
|
|
if (xfs_dabuf_global_list)
|
|
xfs_dabuf_global_list->prev = dabuf;
|
|
dabuf->next = xfs_dabuf_global_list;
|
|
xfs_dabuf_global_list = dabuf;
|
|
spin_unlock(&xfs_dabuf_global_lock);
|
|
}
|
|
#endif
|
|
return dabuf;
|
|
}
|
|
|
|
/*
|
|
* Un-dirty a dabuf.
|
|
*/
|
|
STATIC void
|
|
xfs_da_buf_clean(xfs_dabuf_t *dabuf)
|
|
{
|
|
xfs_buf_t *bp;
|
|
int i;
|
|
int off;
|
|
|
|
if (dabuf->dirty) {
|
|
ASSERT(dabuf->nbuf > 1);
|
|
dabuf->dirty = 0;
|
|
for (i = off = 0; i < dabuf->nbuf;
|
|
i++, off += XFS_BUF_COUNT(bp)) {
|
|
bp = dabuf->bps[i];
|
|
memcpy(XFS_BUF_PTR(bp), (char *)dabuf->data + off,
|
|
XFS_BUF_COUNT(bp));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Release a dabuf.
|
|
*/
|
|
void
|
|
xfs_da_buf_done(xfs_dabuf_t *dabuf)
|
|
{
|
|
ASSERT(dabuf);
|
|
ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
|
|
if (dabuf->dirty)
|
|
xfs_da_buf_clean(dabuf);
|
|
if (dabuf->nbuf > 1)
|
|
kmem_free(dabuf->data);
|
|
#ifdef XFS_DABUF_DEBUG
|
|
{
|
|
spin_lock(&xfs_dabuf_global_lock);
|
|
if (dabuf->prev)
|
|
dabuf->prev->next = dabuf->next;
|
|
else
|
|
xfs_dabuf_global_list = dabuf->next;
|
|
if (dabuf->next)
|
|
dabuf->next->prev = dabuf->prev;
|
|
spin_unlock(&xfs_dabuf_global_lock);
|
|
}
|
|
memset(dabuf, 0, XFS_DA_BUF_SIZE(dabuf->nbuf));
|
|
#endif
|
|
if (dabuf->nbuf == 1)
|
|
kmem_zone_free(xfs_dabuf_zone, dabuf);
|
|
else
|
|
kmem_free(dabuf);
|
|
}
|
|
|
|
/*
|
|
* Log transaction from a dabuf.
|
|
*/
|
|
void
|
|
xfs_da_log_buf(xfs_trans_t *tp, xfs_dabuf_t *dabuf, uint first, uint last)
|
|
{
|
|
xfs_buf_t *bp;
|
|
uint f;
|
|
int i;
|
|
uint l;
|
|
int off;
|
|
|
|
ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
|
|
if (dabuf->nbuf == 1) {
|
|
ASSERT(dabuf->data == (void *)XFS_BUF_PTR(dabuf->bps[0]));
|
|
xfs_trans_log_buf(tp, dabuf->bps[0], first, last);
|
|
return;
|
|
}
|
|
dabuf->dirty = 1;
|
|
ASSERT(first <= last);
|
|
for (i = off = 0; i < dabuf->nbuf; i++, off += XFS_BUF_COUNT(bp)) {
|
|
bp = dabuf->bps[i];
|
|
f = off;
|
|
l = f + XFS_BUF_COUNT(bp) - 1;
|
|
if (f < first)
|
|
f = first;
|
|
if (l > last)
|
|
l = last;
|
|
if (f <= l)
|
|
xfs_trans_log_buf(tp, bp, f - off, l - off);
|
|
/*
|
|
* B_DONE is set by xfs_trans_log buf.
|
|
* If we don't set it on a new buffer (get not read)
|
|
* then if we don't put anything in the buffer it won't
|
|
* be set, and at commit it it released into the cache,
|
|
* and then a read will fail.
|
|
*/
|
|
else if (!(XFS_BUF_ISDONE(bp)))
|
|
XFS_BUF_DONE(bp);
|
|
}
|
|
ASSERT(last < off);
|
|
}
|
|
|
|
/*
|
|
* Release dabuf from a transaction.
|
|
* Have to free up the dabuf before the buffers are released,
|
|
* since the synchronization on the dabuf is really the lock on the buffer.
|
|
*/
|
|
void
|
|
xfs_da_brelse(xfs_trans_t *tp, xfs_dabuf_t *dabuf)
|
|
{
|
|
xfs_buf_t *bp;
|
|
xfs_buf_t **bplist;
|
|
int i;
|
|
int nbuf;
|
|
|
|
ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
|
|
if ((nbuf = dabuf->nbuf) == 1) {
|
|
bplist = &bp;
|
|
bp = dabuf->bps[0];
|
|
} else {
|
|
bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP);
|
|
memcpy(bplist, dabuf->bps, nbuf * sizeof(*bplist));
|
|
}
|
|
xfs_da_buf_done(dabuf);
|
|
for (i = 0; i < nbuf; i++)
|
|
xfs_trans_brelse(tp, bplist[i]);
|
|
if (bplist != &bp)
|
|
kmem_free(bplist);
|
|
}
|
|
|
|
/*
|
|
* Invalidate dabuf from a transaction.
|
|
*/
|
|
void
|
|
xfs_da_binval(xfs_trans_t *tp, xfs_dabuf_t *dabuf)
|
|
{
|
|
xfs_buf_t *bp;
|
|
xfs_buf_t **bplist;
|
|
int i;
|
|
int nbuf;
|
|
|
|
ASSERT(dabuf->nbuf && dabuf->data && dabuf->bbcount && dabuf->bps[0]);
|
|
if ((nbuf = dabuf->nbuf) == 1) {
|
|
bplist = &bp;
|
|
bp = dabuf->bps[0];
|
|
} else {
|
|
bplist = kmem_alloc(nbuf * sizeof(*bplist), KM_SLEEP);
|
|
memcpy(bplist, dabuf->bps, nbuf * sizeof(*bplist));
|
|
}
|
|
xfs_da_buf_done(dabuf);
|
|
for (i = 0; i < nbuf; i++)
|
|
xfs_trans_binval(tp, bplist[i]);
|
|
if (bplist != &bp)
|
|
kmem_free(bplist);
|
|
}
|
|
|
|
/*
|
|
* Get the first daddr from a dabuf.
|
|
*/
|
|
xfs_daddr_t
|
|
xfs_da_blkno(xfs_dabuf_t *dabuf)
|
|
{
|
|
ASSERT(dabuf->nbuf);
|
|
ASSERT(dabuf->data);
|
|
return XFS_BUF_ADDR(dabuf->bps[0]);
|
|
}
|